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Manipulating light at distance by a metasurface using momentum transformation
Optics Express
|July 1, 2014
Summary
A new momentum conservation method precisely controls light manipulation with metasurfaces. This technique allows for complete control over reflected and transmitted light fields for advanced optical applications.
Area of Science:
- Optics and Photonics
- Metamaterials Science
- Electromagnetics
Background:
- Metasurfaces offer precise control over light wavefronts.
- Existing methods for metasurface design can be complex and limited in scope.
Purpose of the Study:
- To introduce a systematic approach for designing metasurfaces with full control over light manipulation.
- To establish a general momentum boundary condition for metasurface synthesis.
Main Methods:
- A momentum conservation approach is developed.
- A general momentum boundary condition is derived to dictate metasurface transformations.
- Metasurfaces are synthesized for specific beam shaping applications.
Main Results:
- Demonstrated complete control over amplitude, phase, and polarization of transmitted and reflected light.
- Successfully synthesized metasurfaces for generating vortex hypergeometric-Gaussian beams and "delayed-start" accelerated beams.
- Designed metasurfaces for pencil beam radiation and holographic repeating functionalities.
Conclusions:
- The momentum transformation approach provides a systematic and versatile method for metasurface design.
- This method enables precise manipulation of light fields for both near-field (Fresnel) and far-field (Fraunhofer) applications.
- The developed technique offers significant advancements in optical beam shaping and control.
